(:*******************************************************:)
(: Test: K-SeqExprCast-151                               :)
(: Written by: Frans Englich                             :)
(: Date: 2007-11-22T11:31:21+01:00                       :)
(: Purpose: At least one number and its designator must be present in a xs:duration value, a minus sign is insufficient. :)
(:*******************************************************:)
xs:duration("-P")